San Fernando, city, Trinidad and Tobago, on the island of Trinidad, on the Gulf of Paria, near Port-of-Spain. It is a rail and road hub lying in an area of sugar estates and mills, sawmills, and oil fields; products from the area are exported from here. One of the world's largest oil-refining and petrochemical centers is at Pointe-à-Pierre, nearby. San Fernando is the site of a teacher-training college. Developed on a Spanish land grant of 1786, the city was chartered in 1846. Population (1991 estimate) 30,115.